JP2013217169A - Rotary snowplow - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary snowplow which prevents snow sucked into a blower via an auger from outflowing to the auger side in front so as to enable power loss to be reduced.SOLUTION: A rotary snowplow includes: an auger taking in snow S; a blower provided at the rear of the auger and accelerated by sucking snow S taken in by the auger to discharge to the outside of a device; and a plurality of blades 21 provided radially in a rotary drive shaft 25 of the blower. A partition member 51, which blocks a front-side opening between the blades 21 and 21 adjacent, is provided in the outer peripheral side front part of the blades 21. The partition member 51 can prevent the snow from outflowing to the auger side. The outflow of the snow outflowing forward, to which a kinetic energy is given by a blower rotational power, is the loss of the kinetic energy, but power loss in the blower and the auger can be prevented by preventing outflowing by the partition member 51.

Description

  The present invention relates to a rotary snowplow that discharges snow such as general roads and railway tracks to a distance.

  In general, a snow removal device for a rotary snowplow has an auger that scrapes snow at the front of the device, and the auger enters the snow as the snowplow moves forward. Lead to the center. In this way, the snow guided to the center is sucked into the blower located thereafter, accelerated by the rotational centrifugal force of the blower, and discharged to the outside of the apparatus at a high speed to perform snow removal work.

  Here, a conventional rotary snowplow will be described with reference to FIGS. FIG. 6 is a side view of a rotary snowplow provided with a rotary snow removal device, and FIG. 7 is a front view. FIG. 8 is a cross-sectional explanatory view of the auger, blower, and casing as viewed from the side, and FIG. 9 is an explanatory view of the blower and casing as viewed from the front.

The vehicle body 2 of the rotary snowplow 1 includes a cab 3, a prime mover 4, traveling drive means (not shown), and the like, and includes a front wheel 5 and a rear wheel 6 driven by the prime mover 4 and the traveling drive means.
A snow removal device 9 including an auger 7 and a blower 8 is mounted in front of the vehicle body 2. The auger 7 has a helical ribbon-shaped blade 12 attached to a rotating shaft 11 and is arranged symmetrically with respect to the center in the axial direction. That is, the twisting direction of the blade 12 of the auger 7 is opposite to the left and right. The auger 7 and the blower 8 are rotated by the power transmitted from the prime mover 4 of the vehicle body 2. The auger 7 rotates in the direction indicated by the arrow U, and the snow S on the road is conveyed to the central portion of the auger 7 by the helical ribbon blades in the opposite directions.

The blower 8 includes a blade 21 that rotates by power and a casing 22 that surrounds the blade 21. The casing 22 has a substantially cylindrical outer peripheral portion 22A and a plate shape that covers the rear portion of the outer peripheral portion 22A. And a rear closing portion 22B. The casing 22 is provided at the rear center of the auger 7 and is disposed in the snow removal device 9 with its cylindrical center in the front-rear direction. Further, a discharge port 23 is provided substantially vertically on the upper side of the outer peripheral portion 22A of the casing 22 in the left-right direction, and a chute 24 is connected to the upper portion of the discharge port 23. The communication opening 27 between the discharge port 23 and the casing 22 opens at an angle of about 60 degrees with respect to the center of the casing 22.
The blower 8 is provided at the center of the rear closing portion 22B of the casing 22 so as to be rotatable in the front-rear direction, and a power transmission gear for driving the rotation driving shaft 25 behind the rear closing portion 22B. A mechanism 26 is provided, and the power transmission gear mechanism 26 rotationally drives the rotary drive shaft 25 using the prime mover 4 as a power source. In addition, normally, 4 to 6 blades 21 are radially attached to the rotary drive shaft 25, and in this example, 5 blades 21 are provided.

  In the structure of the casing 22, the front side of the blade 21 is completely open without partitioning, but the rear surface side of the blade 21 and the radial outer peripheral portion 22 </ b> A are covered and closed. However, the cover of the outer peripheral portion 22A is provided with a communication opening portion 27 that is partially opened in order to discharge snow to the outside of the apparatus, and the discharge port 23 is erected in the communication opening portion 27.

  The blades 21 of the blower 8 are made of a plate material in the front-rear direction, and an outer peripheral side front edge portion 31 located on the outer peripheral portion is formed in a substantially vertical direction. A substantially arc-shaped center-side front edge portion 32 is formed, and the center-side front edge 32 is formed so that the front and rear dimensions of the blades 21 are shorter on the center side than on the outer peripheral side. Further, the outer peripheral side rear edge portion 33 of the blade 21 is formed in a substantially vertical direction, and an oblique central side rear edge portion 34 extending from the inner end of the outer peripheral side rear edge portion 34 to the rotary drive shaft 25 is provided. . The rear part of the blade 21 is partitioned and closed by a closing plate 35, but the front part 37 between the adjacent outer peripheral side blades 21 is opened by a front opening 37. The closing plate 35 is fixed to the outer peripheral side rear edge portion 33, the central side rear edge portion 34, and the rotation drive shaft 25. Further, the outer peripheral side front edge portion 31 is provided with a bent portion 36 of approximately 90 degrees in the rotation direction indicated by the arrow V or a gentle arc-shaped bent portion 36.

  The angle θk of the opening range of the communication opening 27 is in the range of about 60 degrees out of the entire 360 degrees, and the other range of about 300 degrees is closed with a slight gap from the outer periphery of the blade 21.

  The reason for the blockage in the range of about 300 degrees is that the target is fluid in a centrifugal blower of fluid such as air, water, etc., so that the casing inner periphery is gradually expanded in a spiral shape from the outer periphery of the blade 21 in the radial direction. The pressurized fluid flows through the space between the casing and the casing to reach the discharge port.

  On the other hand, since snow does not have fluidity, if a space is formed by expanding the inner periphery of the casing from the outer periphery of the blades 21, the space is clogged with snow, resistance increases, rotational power becomes excessive, and finally rotation is impossible. It becomes. Therefore, the outer peripheral portion 22 </ b> A of the casing 22 of the snow removal device is closed only by providing a slight gap that prevents the tip of the rotating blade 21 from contacting the casing 22.

  The blower 8 is a mechanism for sucking, accelerating, and discharging the snow S. The suction is sucked in the vicinity of the rotation center of the blower 8 where negative pressure is generated. The snow S sucked in is moved while accelerating from the vicinity of the center toward the outer peripheral direction as indicated by an arrow b by the centrifugal force generated by the rotation of the blades 21 and reaches the outer peripheral part 22A. 27 is discharged to the outside through the discharge port 23 and the chute 24. That is, the blower 8 rotates in the direction of the arrow V that discharges the snow S from the discharge port 23.

  Here, the snow that has reached the outer peripheral portion 22A cannot go out in the radial direction as shown by the arrow c in the closed range of about 300 degrees, and accumulates there. However, since the front side between the blades 21 and 21 is open without a partition, the snow S within an angle smaller than the repose angle θ remains accumulated in the casing 22, but the snow is within a range greater than the repose angle θ. S cannot stay in the casing 22 and slides down the inclination of the repose angle θ as shown by an arrow d and flows out to the front auger 7 side. In this case, a bent portion 36 is provided at the front end of the blade 21, but since the space between the bent portion 36 and the adjacent blade 21 is opened by the front opening 37, snow S is generated from here. It flows out to the front auger 7 side. The angle of repose is an angle that accumulates stably without collapsing, and is a dynamic angle of repose added with centrifugal force and the like.

  The acting force that slides down the slope is a centrifugal force due to the rotation of the blades 21, that is, a force that consumes the rotational power of the blower 8.

  In the conventional rotary snowplow having the above-described configuration, two power losses have occurred. That is, one is a power loss of the blower 8 and the other is a power loss of the auger 7.

  Due to the power loss of the blower 8, the snow mass accelerated by the blower 8 and discharged to the outside of the device at a high speed from the discharge port 23 is the snow mass removed from the snow, and the power required for this worked as effective power. It will be.

  However, as described above, the snow S sent from the auger 7 to the blower 8 and again flowing out to the front auger 7 side does not perform any snow removal work. Moreover, the snow S that has flowed out to the auger 7 side is picked up by the auger 7 again, returned to the blower 8 and sucked therein, and is again accelerated by consuming power. That is, the motion of the snow S that flows forward and returns to the blower 8 is a repetitive motion that is not necessary at all, and all the blower power required for this is loss power. This outflowing range is a closed section of about 300 degrees out of the entire 360 degrees.

Regarding the power loss of the auger 7, when the snow S once sent to the blower 8 returns again and sends it again to the blower 8, the repetitive motion becomes power loss.
Here, it is further disadvantageous in terms of power, and the snow S flowing out of the blower 8 collides with the auger 7 at a speed unlike the stationary snow. Therefore, the auger 7 has to push back the collision pressure to send the snow S to the blower 8, and further increases the power loss of the auger 7.

  However, although there was such a movement of the snow S inside the snow removal device 9, in the actual snow removal work, the snow S flows out forward of the blower 8 because the auger 7 and the blower 8 are in a set. However, since the auger 7 located in front of it picked up the snow, the snow S did not flow out to the outside of the snow removal device 9, and there was no problem in actual work. However, since a large power loss existed in the snow removal device 9, the energy efficiency of the rotary snowplow 1 was low.

  Therefore, in view of the above-described problems, an object of the present invention is to provide a rotary snow plow capable of preventing the blower snow from flowing out to the forward auger and reducing power loss.

  In order to achieve the above object, an invention according to claim 1 includes an auger that takes snow into the apparatus, and a blower that is provided behind the auger and that discharges the snow taken in by the auger to the outside of the apparatus, In a rotary snowplow having a rotary drive shaft and a plurality of radially provided blades coupled to the rotary drive shaft, the blower has a ring shape that closes a front opening between the adjacent blades on the outer front side of the blade. The partition member which makes is provided.

  Moreover, the invention which concerns on Claim 2 formed the inner end side of the front surface of the said partition member in the center back direction, It is characterized by the above-mentioned.

  According to the rotary snowplow according to claim 1 of the present invention, the partition member can prevent the snow from flowing out to the auger side. The snow that flowed forward was snow that was given kinetic energy by the blower rotational power, and the spillage had lost its kinetic energy.However, by preventing the outflow by the partition member, power loss in the blower was reduced. Can be prevented.

  Also, the snow that flowed forward collided with the auger, and the auger consumed power and pushed it back to the blower again. However, the outer ring prevents the forward outflow, so this auger power loss can also be prevented. .

  Moreover, according to the rotary snowplow according to claim 2 of the present invention, the snow from the auger can be sucked smoothly into the center side of the blower.

It is a front view of the principal part of the blower which provided the partition member which shows Example 1 of this invention. It is a longitudinal cross-sectional view of the principal part of the blower which provided the partition member same as the above. It is a front view of the principal part of the blower which provided the partition member which shows Example 2 of this invention. It is a longitudinal cross-sectional view of the principal part of the blower provided with the partition member which shows Example 3 of this invention. It is a longitudinal cross-sectional view of the principal part of the blower provided with the partition member which shows Example 4 of this invention. It is a side view of a rotary snowplow. It is a front view of a rotary snowplow. It is a cross-sectional explanatory drawing of an auger, a blower, and a casing part. It is explanatory drawing which looked at the blower and the casing from the front.

  Hereinafter, Embodiment 1 of the rotary snowplow of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same part as the said FIGS. 6-9, and the description is abbreviate | omitted.

  1 to 2 show a first embodiment of the present invention, and FIG. 1 shows the blower 8 as viewed from the front, and shows a form in which a partition member 51 formed of a concentric belt-like ring is attached to the outer peripheral tip of the blade 21. . FIG. 2 is a longitudinal sectional view in which a part of the main part of the blower 8 is sectioned. In the blower 8 of the present embodiment, the ring-shaped partition member 51 centering on the rotary drive shaft 25 is formed from a plate material, The partition member 51 is fixed to the outer peripheral side front edge portion 31 of the plurality of blades 21, and all the front side openings 37 are closed. In this case, the partition member 51 is fixed to the bent portion 36. Further, the outer peripheral edge portion 52 and the inner peripheral edge portion 53 of the partition member 51 form a concentric circle with the rotary drive shaft 25 as the center, and the outer peripheral edge portion 52 is at a substantially outer end position of the blade 21, and the inner peripheral edge portion 53. Is at the substantially inner end position of the leading edge of the bent portion 36, and the center of the partition member 51 is open. A slight gap that prevents contact with the casing 22 is provided between the outer peripheral edge portion 52 and the outer peripheral portion 22 </ b> A of the casing 22. Moreover, as shown in FIG. 2, the cross section of the partition member 51 is directed substantially in the vertical direction.

  Thus, in the present embodiment, corresponding to claim 1, the auger 7 for taking in the snow S and the blower 8 provided behind the auger 7 for discharging the snow S taken in by the auger 7 in a predetermined direction are provided. In the rotary snowplow 1 in which the blower 8 has a rotary drive shaft 25 and a plurality of radially provided blades 21 that are radially coupled to the rotary drive shaft 25, the blades adjacent to the front part on the outer peripheral side of the blade 21 By providing the partition member 51 that closes the front opening 37 between 21 and 21, the partition member 51 can prevent the snow S from flowing out to the auger 7 side. This snow S flowing out forward is snow given kinetic energy by the blower rotational power, and the outflow was disappearing of kinetic energy, but by preventing the outflow by the partition member 51, This will prevent power loss.

  Furthermore, the forward outflow from the blower 8 to the auger 7 is a flow in the direction opposite to the predetermined snow movement sent from the auger to the blower, and disturbs and inhibits the snow movement from the auger to the blower. However, by preventing forward outflow, the snow moves smoothly from the auger to the blower.

  Further, conventionally, the snow S that has flowed forward collides with the auger 7, and the auger 7 again consumes power and pushes it back to the blower 8 again. The power loss of the auger 7 can also be prevented.

  Thus, the partition member 51 of the present invention has an effect of eliminating the power loss that the blower 8 and the auger 7 have inside. Eliminating power loss is also energy saving. If the power loss decreases as the capacity of the snowplow 1, the amount is used as effective snow throwing power, and the amount of processed snow removal per hour of the same snowplow increases. That is, the time required for snow removal on the roads and tracks in the same section is shortened, and there is an effect that contributes to speeding up the maintenance of the traffic network in the snowy season.

  Embodiment 2 of the present invention will be described below with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to the same part as the said FIGS. 6-9 and Example 1, and the description is abbreviate | omitted. As shown in FIG. 3, in the partition member 51 of this example, the outer peripheral edge portion 52 is concentric with the rotary drive shaft 25, while the partition member 51 is between the blades 21 and 21, as in the first embodiment. The inner and outer peripheral portions 53A are formed so that the inner and outer widths are narrow on the front side in the rotational direction and wide on the rear side in the rotational direction.

When the blower 8 rotates in the direction to release the snow S, the rotation direction front surface 21F side of the blade 21 holds the snow S, and the rotation direction rear surface 21B side of the blade 21 becomes negative pressure. By increasing the size, the suction of the snow S is facilitated.
As described above, in this embodiment, the same operations and effects as those of the first embodiment are obtained in correspondence with claims 1 and 2.

  Further, as an effect of the embodiment, the outer peripheral edge 52 of the partition member 51 is substantially concentric with the rotation drive shaft 25 that is the rotation center, and the partition member 51 is in the rotational direction rear surface 21B side from the rotational direction front surface 21F side of the blade 21. By forming the inner peripheral edge 53A so as to be narrow, the central opening on the rear surface 21B side in the rotational direction of the blade 21 where negative pressure is generated by rotation is more than the central opening on the front surface 21F side in the rotational direction of the blade 21 Since it becomes wide, the suction of the snow S into the blower 8 can be performed smoothly.

Embodiment 3 of the present invention will be described below with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to the same part as the said FIGS. 6-9 and each Example, and the description is abbreviate | omitted. In this example, as shown in FIG. 4, the inner peripheral edge 53 of the partition member 51 is obliquely arranged in the center rearward direction of the blower 8, and the outer peripheral edge 52 side of the partition member 51 is in the vertical direction. The inner peripheral edge 53 side faces the center rearward of the blower 8, and the angle θm with respect to the vertical direction of the front surface 51M is about 1 to 45 °, preferably about 10 to 35 °. The front surface 51M is obliquely provided over the entire circumference, but at least a part of the front surface 51M may be obliquely provided.
In FIG. 2, since the angle θm is 0 degree, the angle θm can be set to 0 to 45 degrees.

  As described above, in this embodiment, the same effects as those in Embodiments 1 and 2 are obtained corresponding to Claim 1, and in this example, the front surface 51M of the partition member 51 is corresponded to Claim 2. Since the inner end of the auger 7 is formed in the center rearward direction, the snow S from the auger 7 can be sucked into the center side of the blower 8 smoothly.

  Embodiment 4 of the present invention will be described below with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to the same part as said FIGS. 6-9 and each Example, and the description is abbreviate | omitted. In this example, as shown in FIG. 5, the entire partition member 51 is obliquely arranged at the same angle, so that the front surface 51M of the partition member 51 is obliquely arranged in the center rearward direction of the blower 8, and corresponds to each claim. Thus, the same operations and effects as the above-described embodiments are obtained.

DESCRIPTION OF SYMBOLS 1 Rotary snowplow 7 Auger 8 Blower 9 Snow removal apparatus S Snow (theta) Repose angle 21 Blade | wing 22 Casing 37 Front side opening 51 Partition member 51M Front surface 52 Outer peripheral edge 53 Inner peripheral edge

Claims (2)

  An auger that takes in snow into the apparatus and a blower that is provided behind the auger and that discharges the snow taken in by the auger to the outside of the apparatus. The blower is coupled to the rotary drive shaft and the rotary drive shaft. A rotary snowplow having a plurality of blades provided radially, wherein a ring-shaped partition member is provided to close a front opening between adjacent blades on an outer peripheral side front portion of the blade.   The rotary snowplow according to claim 1, wherein an inner end side of the front surface of the partition member is formed in a center rearward direction.

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